Politics will be a big story this week

CNBC's John Harwood is out with story saying Republicans must face "three fundamental realities" on the bill.

"It would only modestly boost economic growth.

It would significantly increase the national debt.

It would give the most money to the richest Americans."

Ouch.

He looks at various economic projections of the bill from the right and left with few saying there will be any significant pickup in growth.

Against this, Harwood warns that donors will punish Republicans if they fail to pass the legislation.